Achievements/研究成果
PrePrInt
D. Kozawa, S. Fujii, and Yuichiro K. Kato, "Intrinsic process for upconversion photoluminescence via K-momentum phonon coupling in carbon nanotubes," arXiv:2404.03849
D. Yamashita, N. Fang, S. Fujii, Y. K. Kato, Hybrid silicon all-optical switching devices integrated with two-dimensional material,"" arXiv:2403.18199
C. F. Fong, D. Yamashita, N. Fang, S. Fujii, Y. -R. Chang, T. Taniguchi, K. Watanabe, and Y. K. Kato, "Self-aligned hybrid nanocavities using atomically thin materials, " arXiv:2308.10566
R. Imamura, S. Fujii, A. Nakashima, and T. Tanabe, "Exceptional point proximity-driven mode-locking in coupled microresonators," arXiv:2309.05912
K. Maezawa, S. Fujii, K. Yamanoi, Y. Nozaki, S. Watanabe, "Spatiotemporal visualization of a surface acoustic wave coupled to magnons across a submillimeter-long sample by pulsed laser interferometry" arXiv:2312.07029. Phys. Rev. Appl., Accepted for publication
2024-2021
R. Shibata, S. Fujii, and S. Watanabe, "Integer-locking condition for stable dual-comb interferometry in situations with fluctuating frequency-comb repetition rates," Opt. Express 32, 17373-17387 (2024).
S. Fujii, K. Wada, S. Kogure, H. Kumazaki, and T. Tanabe, "Mechanically actuated Kerr soliton microcombs," Laser & Photonics Rev. 2301329 (2024).
N. Fang, Y. R. Chang, S. Fujii, D. Yamashita, M. Maruyama, Y. Gao, C. F. Fong, D. Kozawa, K. Otsuka, K. Nagashio, S. Okada, and Y. K. Kato, "Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures," Nat. Commun. 15, 2871 (2024).
S. Fujii, N. Fang, D. Yamashita, D. Kozawa, C. F. Fong, Y. K. Kato, "van der Waals decoration of ultra-high-Q silica microcavities for χ(2)-χ(3) hybrid nonlinear photonics," Nano Lett. 24, 4209-4216 (2024).
S. Sota, K. Handa, S. Fujii, T. Tanabe, Y.Uzawa, K. Furusawa, and N. Sekine, "Fabrication of silicon nitride based high-Q microring resonators prepared by the hot-wire CVD method and their applications to frequency comb generation," Opt. Mater. Express 14, 1128-1138 (2024).
D. Moreno, S. Fujii, A. Nakashima, D. Lemcke, A. Uchida, P. Sanchis, and T. Tanabe, "Synchronization of two chaotic microresonator frequency combs," Opt. Express 32, 2460 (2024).
N. Fang, Y. R. Chang, D. Yamashita, S. Fujii, M. Maruyama, Y. Gao, C. F. Fong, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato, "Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes," Nat. Commun. 14, 8152 (2023).
S. Sugawara, S. Fujii, S. Kawanishi, T. Tanabe, "Stability and mutual coherence of Raman combs in high-Q silica microresonators," Opt. Continuum 2, 1588-1596 (2023).
D. Nishikawa, K. Maezawa, S. Fujii, M. Okano, S. Watanabe, "A two-color dual-comb system for time-resolved measurements of ultrafast magnetization dynamics using triggerless asynchronous optical sampling," Rev. Sci. Instrum. 94, 063003 (2023).
S. Fujii, K. Wada, R. Sugano, H. Kumazaki, S. Kogure, Y. K. Kato, T. Tanabe, "Versatile tuning of Kerr soliton microcombs in crystalline microresonators," Commun. Phys., 6, 1 (2023).
B. Yu, S. Naka, H. Aoki, K. Kato, D. Yamashita, S. Fujii, Y. K. Kato, T. Fujigaya, and T. Shiraki, "ortho-Substituted Aryldiazonium Design for the Defect Configuration-Controlled Photoluminescent Functionalization of Chiral Single-Walled Carbon Nanotubes," ACS Nano 16, 12, 21452–21461 (2022).
N. Fang, D. Yamashita, S. Fujii, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato, "Quantization of mode shifts in nanocavities integrated with atomically thin sheets," Adv. Opt. Mater. 10, 19, 2200538 (2022).
A. Nakashima, S. Fujii, R. Imamura, K. Nagashima, and T. Tanabe, "Deterministic generation of a perfect soliton crystal microcomb with a saturable absorber," Opt. Lett. 47, 6, 1458-1461 (2022).
Y. Hayama, S. Fujii, T. Tanabe, and Y. Kakinuma, "Theoretical approach on the critical depth of cut of single crystal MgF2 and application to a microcavity," Precision Engineering 73, 234-243 (2022).
S. Fujii, S. Tanaka, T. Ohtsuka, S. Kogure, K. Wada, H. Kumazaki, S. Tasaka, Y. Hashimoto, Y. Kobayashi, T. Araki, K. Furusawa, N. Sekine, S. Kawanishi, and T. Tanabe, “Dissipative Kerr soliton microcombs for FEC-free optical communications over 100 channels," Opt. Express, 30, 2, 1351-1364 (2022).
T. S. L. P. Suzuki, A. Nakashima, K. Nagashima, R. Ishida, R. Imamura, S. Fujii, S. Y. Set, S. Yamashita, and T. Tanabe, "Design of a passively mode-locking whispering-gallery-mode microlaser," J. Opt. Soc. Am. B 38, 10, 3172-3178 (2021).
2020-2016
S. Fujii, Y. Hayama, K. Imamura, H. Kumazaki, Y. Kakinuma, and T. Tanabe, "All-precision-machining fabrication of ultrahigh-Q crystalline optical microresonators," Optica, 7, 6, 694-701 (2020). "Press release"
S. Fujii and T. Tanabe, "Dispersion engineering and measurement of whispering gallery mode microresonator for Kerr frequency comb generation," Nanophotonics, 9, 5, 1087-1104 (2020).
S. Fujii, S. Tanaka, M. Fuchida, H. Amano, Y. Hayama, R. Suzuki, Y. Kakinuma, and T. Tanabe, "Octave-wide phase-matched four-wave mixing in dispersion engineered crystalline microresonators," Opt. Lett., 44, 12, 3146-3149 (2019). "Editor's pick"
Y. Zhuang, H. Kumazaki, S. Fujii, R. Imamura, N. A. B. Daud, R. Ishida, H. Chen, and T. Tanabe, "Coupling of a whispering gallery mode to a silicon chip with photonic crystal," Opt. Lett. 44, 23, 5731-5734 (2019).
T. Tanabe, S. Fujii, and R. Suzuki, "Review on microresonator frequency comb", Japanese Journal of Applied Physics 58, SJ0801 (2019).
R. Suzuki, S. Fujii, A. Hori, and T. Tanabe, "Theoretical study on dual-comb generation and soliton trapping in a single microresonator with orthogonally polarized dual-pumping", IEEE Photon. J. 11, 1, 1-11 (2019).
S. Fujii, Y. Okabe, R. Suzuki, T. Kato, A. Hori, Y. Honda, and T. Tanabe, "Analysis of mode coupling assisted Kerr comb generation in normal dispersion system," IEEE Photon. J., 10, 5, 1-11 (2018).
S. Fujii, T. Kato, R. Suzuki, A. Hori, and T. Tanabe, "Transition between Kerr comb and stimulated Raman comb in a silica whispering gallery mode microcavity," J. Opt. Soc. Am. B, 35, 1, 100-106 (2018). "Editor's pick"
Y. Honda, W. Yoshiki, T. Tetsumoto, S. Fujii, K. Furusawa, N. Sekine, and T. Tanabe, "Brillouin lasing in coupled silica toroid microcavities", Appl. Phys. Lett. 112 20, 201105 (2018).
R. Suzuki, A. Kubota, A. Hori, S. Fujii, and T. Tanabe, "Broadband gain induced Raman comb formation in a silica microresonator", J. Opt. Soc. Am. B 35, 4, 933-938 (2018).
S. Fujii, A. Hori, T. Kato, R. Suzuki, Y. Okabe, W. Yoshiki, A. C.-Jinnai, and T. Tanabe, "Effect on Kerr comb generation in a clockwise and counter-clockwise mode coupled microcavity," Opt. Express, 25, 22, 28969-28982 (2017).
S. Fujii, T. Kato, R. Suzuki, and T. Tanabe, "Third-harmonic blue light generation from Kerr clustered combs and dispersive waves," Opt. Lett., 42, 10, 2010-2013 (2017).
T. Kato, A. Hori, R. Suzuki, S. Fujii, T. Kobatake, and T. Tanabe, "Transverse mode interaction via stimulated Raman scattering comb in a silica microcavity", Opt. Express 25, 2, 857-866 (2017).
A. C.-Jinnai, T. Kato, S. Fujii, T. Nagano, T. Kobatake, and T. Tanabe, "Broad bandwidth third-harmonic generation via four-wave mixing and stimulated Raman scattering in a microcavity", Opt. Express 24, 23, 26322-263131 (2016).
Books & Japanese articles
藤井 瞬, "超精密機械加工技術が拓くマイクロ周波数コム応用", フォトニクスニュース, 7, 2, 60-64 (2021).
藤井 瞬，鈴木 良，堀 敦裕，久保田啓寛，田邉孝純, "微小共振器におけるカーコムの数値シミュレーション法", レーザー研究, 46, 2, 86-91 (2018).
Current/Former Affiliations & Collaborators
Watanabe Group, Keio University | 渡邉研究室，慶應義塾大学理工学部物理学科
Kato Nanoscale Quantum Photonics Laboratory, RIKEN | 加藤ナノ量子フォトニクス研究室，理化学研究所
Tanabe Photonic Structure Group, Keio University | 田邉フォトニック構造研究室，慶應義塾大学理工学部電気情報工学科